On December 4, 2015, the Federal Aviation Administration’s (FAA) released Advisory Circular for Obstruction Marking and Lighting 70/7460-1L (AC 70/7460-1L), which cancels and replaces Advisory Circular 70/7460-1K. This release effectively amends the lighting requirements applicable to towers that must be registered in the Commission’s Antenna Structure Registration (ASR) system. For additional details, read more in the FCC Public Notice DA-1391 or on our environmental compliance page.